FadeIn, FadeOut

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;

public class Test_FadeInMain : MonoBehaviour
{
    [SerializeField]
    private Image dim;

    private System.Action onFadeInComplete;
    // Start is called before the first frame update
    void Start()
    {
        this.onFadeInComplete = () => {
            //영웅추가
        };
        this.StartCoroutine(this.FadeIn());
    }

    private IEnumerator FadeIn()
    {
        Color color = this.dim.color;
        //어두워져야함
        while (true)
        {
            color.a -= 0.01f;
            this.dim.color = color;

            Debug.Log(this.dim.color.a);
            if (this.dim.color.a <= 0)
            {
                break;
            }
            yield return null;
        }
        this.onFadeInComplete();
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;

public class Test_FadeOutMain : MonoBehaviour
{
    [SerializeField]
    private Image dim;

    private System.Action onFadeOutComplete;
    // Start is called before the first frame update
    void Start()
    {
        this.onFadeOutComplete = () => {
            //씬전환
            SceneManager.LoadScene("Test_FadeIn");
        };
        this.StartCoroutine(this.FadeOut());
    }

    private IEnumerator FadeOut()
    {
        Color color = this.dim.color;
        //어두워져야함
        while(true)
        {
            color.a += 0.01f;
            this.dim.color = color;

            Debug.Log(this.dim.color.a);
            if(this.dim.color.a >= 1)
            {
                break;
            }
            yield return null;
        }
        this.onFadeOutComplete();
    }
}